第一颗跟踪和数据中继卫星系统的卫星目前正在TRW公司进行测试,准备在明年一月用航天飞机发射。第二颗卫星正在装配,预定在明年年中发射。这种大数据率的跟踪与数据中继卫星系统是用在地面用户和其它轨道飞行器之间传输数据的轨道中继系统,该系统包括东、西两颗卫星,两星的定点位置相距130°。第一颗星早已装配完毕,并经过测试和部分验收,后来接到进行修改的要求。这些更改包括:为适应从航天飞机 The first satellite for tracking and data relay satellite systems is currently being tested at TRW to be launched by a space shuttle in January next year. The second satellite is being assembled and is scheduled to launch mid-next year. This large data rate tracking and data relay satellite system is an orbital relay system used to transmit data between land-based users and other orbiting vehicles, including east and west two satellites with fixed-point positions 130 ° apart . The first star has already been assembled and has been tested and partially accepted, and later received a request for changes. These changes include: To adapt from the shuttle